Last year I gave testimony to the environment committee here at the House of Commons on that topic. I've written quite a lot on the biofuels. Without going into a lot of detail, it has been my judgment that the second generation of biofuels is quite a considerable distance away, and it's unlikely to be proven commercial in my lifetime, I would say. It's at least a long way away.
There has been a lot of research going into it, and certainly we can do it. It's feasible, but it's just terribly expensive.